Question

in an ap ,if the 12 th term is -13 and the sum of first 4terms is 24. what is the sum of the first 10 terms?

Answer 1

Step-by-step explanation:

Given,

a12=-13

a+11d=-13............(i)

S4=24

4/2(2a+4-1d)=24

2(2a+3d)=24.............(ii).

Solve (i) and (ii) for a and d and put the values of a and d in..... (iii)

S10=?

10/2(2a+9d)=?

5(2a+9d)=?...........(iii).

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